真(zhen)空(kong)(kong),這一術語譯自拉丁文vacuo,其意義是虛無。其實真(zhen)空(kong)(kong)應理解為(wei)氣(qi)體較稀薄的(de)空(kong)(kong)間。在(zai)指定的(de)空(kong)(kong)間內(nei),低于一個(ge)大(da)氣(qi)壓(ya)力的(de)氣(qi)體狀(zhuang)態統(tong)稱為(wei)真(zhen)空(kong)(kong)。真(zhen)空(kong)(kong)狀(zhuang)態下氣(qi)體稀薄程度稱為(wei)真(zhen)空(kong)(kong)度(degreeofvacuum),通(tong)常用(yong)壓(ya)力值(zhi)表示。因此真(zhen)空(kong)(kong)包(bao)裝實際上不是完全(quan)真(zhen)空(kong)(kong)的(de),采用(yong)真(zhen)空(kong)(kong)包(bao)裝技術包(bao)裝的(de)食(shi)品容器內(nei)的(de)真(zhen)空(kong)(kong)度通(tong)常在(zai)600-1333Pa。所以,又將真(zhen)空(kong)(kong)包(bao)裝稱為(wei)減壓(ya)包(bao)裝或(huo)排氣(qi)包(bao)裝。
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